GIS simplifies the redistricting process by offering a clear view of all possible variations in the electoral map to ensure that users meet all requirements. Mapping programs prevent common errors, such as failing to meet rules that call for contiguity—meaning you can travel between any two points within a district without crossing into another district—and compactness. Government agencies and voter advocacy groups can draft multiple proposed plans and demonstrate the effects of various approaches, like how moving a border might divide a community of interest.